update gitlab ci file

.gitlab-ci.yml

@@ -9,7 +9,7 @@ build:
     script: 
         - pacman -Sy && pacman -S --noconfirm bison flex gettext sdl2 lib32-glibc grep
         - export AM_HOME=$(pwd)/nexus-am/
-        - cd nemu && make
+        - cd nemu && make EXTRA_FLAGS='-DDISABLE_MMIO'
         - show_log=1 ./runall.sh &> testcases.log ; echo $? > testres.log
     artifacts:
         paths:
@@ -17,6 +17,12 @@ build:
             - nemu/testcases.log
         expire_in: 1 week
 
+build-icc-pgo:
+    stage: build
+    script:
+        - pacman -Sy && pacman -S --noconfirm bison flex gettext sdl2 lib32-glibc grep
+        - export AM_HOME=$(pwd)/nexus-am/
+        - cd nemu && ./icc-build.sh
 
 test:
     stage: test

nemu/Makefile

@@ -16,12 +16,11 @@ include Makefile.git
 .DEFAULT_GOAL = app
 
 # Compilation flags
-CXX = icpc
+CXX ?= g++
 LD = $(CXX)
-EXTRA_FLAGS ?= -prof-use
 INCLUDES  = $(addprefix -I, $(INC_DIR))
 CFLAGS   += -O3 -MMD -Wall $(INCLUDES) -fomit-frame-pointer -std=c++17
-CFLAGS   += -no-ansi-alias -DDISABLE_MMIO -no-complex-limited-range -qopt-prefetch=2 $(EXTRA_FLAGS)
+CFLAGS   += $(EXTRA_FLAGS)
 # CFLAGS   += -DDIFF_TEST_QEMU
 
 # Source code generation before any targets.

nemu/icc-build.sh

+#!/bin/bash
+
+xflags="-no-ansi-alias -DDISABLE_MMIO -no-complex-limited-range -qopt-prefetch=2"
+cpus=$(grep -c '^processor' /proc/cpuinfo)
+
+make clean &&
+make EXTRA_FLAGS="$xflags -prof-gen" CXX=icpc -j$cpus &&
+make -C "$AM_HOME/apps/microbench" ARCH=x86-nemu &&
+build/nemu -b "$AM_HOME/apps/microbench/build/microbench-x86-nemu.bin" &&
+make clean &&
+make EXTRA_FLAGS="$xflags -prof-use" CXX=icpc -j$cpus
+
+exit $?
+

nemu/src/device/vga.cc

@@ -37,11 +37,13 @@ static void init_vga_impl() {
 }
 
 void update_screen() {
+#ifndef DISABLE_MMIO
   if(window == nullptr) init_vga_impl();
   SDL_ErrorCheck(SDL_UpdateTexture(texture, NULL, vmem, SCREEN_W * sizeof(vmem[0][0])));
   SDL_ErrorCheck(SDL_RenderClear(renderer));
   SDL_ErrorCheck(SDL_RenderCopy(renderer, texture, NULL, NULL));
   SDL_RenderPresent(renderer);
+#endif
 }
 
 void init_vga() {